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Costs Related to Repurchase Increased Interest Expense.

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- Definition

Repurchase of debentures.

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- Definition

The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

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-Name Accounting Principles Board Opinion (APB)

-Number 21

-Paragraph 16, 20

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Interest rate stated in the contractual debt agreement.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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-Subparagraph (SX 210.5-02.22(a)(1))

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Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year.

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Debt (Details Textual) (USD $) In Thousands, unless otherwise specified	12 Months Ended					12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 04, 2012 1.35% Senior notes due 2017 [Member]	Dec. 04, 2012 4.00% Senior notes due 2042 [Member]	Dec. 31, 2010 7.45% Debentures due 2097 [Member]	Jun. 30, 2010 7.45% Debentures due 2097 [Member]
Debt (Textual) [Abstract]
Issue of debt securities				$ 700,000	$ 300,000
Debt instrument, interest rate				1.35%	4.00%		7.45%
Repurchase of debentures						136,500
Costs related to the repurchase increased interest expense			24,165
Additional Debt (Textual) [Abstract]
Maturities of long-term debt 2013	3,689
Maturities of long-term debt 2014	500,488
Maturities of long-term debt 2015	325
Maturities of long-term debt 2016	(146)
Maturities of long-term debt 2017	700,149
Interest expense on long-term debt	$ 36,188	$ 31,883	$ 64,442